Construction industry is one of the main drivers of financial development in numerous countries not leaving out Nigeria. The industry faces a long rundown of ethics/moral difficulties identified with practices from its professionals. So therefore, the supposition study of this report demonstrated that there are basic conduct of concern with respect to unethical practices among Quantity Surveyors in Nigerian construction industry. The motivation behind this paper is to evaluate the level of unethical conduct among Quantity Surveyors by featuring most normal unethical conduct by Quantity Surveyors in their administrations conveyance in the Nigerian construction industry. Questionnaires enumerating 21 unethical practices by Quantity Surveyors which were sent to professionals in construction firms within the Nigerian construction industry to assess. Altogether, 114 legitimate reactions were investigated by mean item score and exploratory factor analysis. In view of the mean score, ?Supplanting?, ?Concealing of professional errors? and ?Conflict of interest? are the most widely recognized unethical behaviour and conduct of Quantity Surveyors in their administrations conveyance in the investigation territory. From the aftereffects of factor analysis, six main practices were extracted, these are: Dishonesty, Insincerity, Financial mismanagement, Information leaking, Negligence, and Conflict of interest. While this study fills in as significant wellspring of reference for general learning on ethical behavior and moral conduct of Quantity surveyors in construction industry. The methodology utilized in this study can be replicated by different professionals in the construction industry like Architect, Contractors, Builders and the Engineers. This can likewise be duplicated in different areas for further studies. Moreover, further studies may utilize more techniques in gathered the information. . For this study, only questionnaire survey is utilized. Using several techniques will make the outcomes more adaptable and precise. Method such as interview, comparing data and many more can be adopted, this may explore the connections between the principal factors and their related factors. This study has given valuable data with respect to unethical conduct by Quantity Surveyors. However, the restriction is characteristic in the number of respondents in the investigation which is constrained just to the exploration zone. This study will be important wellspring of reference for general learning on ethical conduct of Quantity surveyors in Nigerian construction industry for researchers and various stakeholders in the industry. This study will be advantageous to all relevant parties that associated with the construction industry extending from those engaged with scholastic research, understudy and experts in the construction industry. The result introduced in this study give adequate confirmation and valuable pointers to illuminate a few confusions about unethical conduct in the construction industry.